Gear shifting mechanism



Filed April 20, 1959 4 Sheets-Sheet l Sept. 29, 1942.

' inks. SANFORD EI'AL GEAR SMHT-ING MECHANISM Fiiled April 30, 1939.

4 Sheets-Sheet 3 Sept. 29, 1942 R. s. SANFORD ETAL- 2,297,026

GEAR 'SHIFTINGf ME'CHANISM Filed April 20,1959

4 Sheets-Sheet 4 3W, s Rb 5.5 0nd Patented se t ze', 1942 cram smr'rme MECHANISM Roy s. Sanford, wmim J. Andrea, and newick F. Bohr-er, Jr.,

Bendix-Westinghouse Company, Pittsburgh, Pa., a eorpo V aware Pittsburgh, Pa", ass'ignors to Automotive Air Brake tion ofDel- Application April 20, 1939, Serial No. 268,982

9 Claims. (Cl. 14-346) This invention relates to gear-shifting mechanism and more particularly to a power-operated control apparatus for effecting the various gear-changing operations of a motor vehicle;

transmission.

One ofthe objects of the present invention is to provide a novel power-operated motor vehicle transmission capable of being remotely controlled in an eflicient manner.

Another object is to provide a remotely-controllable. power-operated mechanism for effecting the various shifts of a transmission of the type having a plurality of shift bars movable in opposite directions to establish various gear relations. I e

A further object is to provide, in a mechanism of the above character, a novel arrangement forinsuring proper operation of the power devices in the selection and shifting of desired transmission members.

A still further object includes I the provision of a novel interlocking mechanisnf in order to prevent power operation of a transmission shift bar until all-bars are in neutral position, such feature thereby materially constributing to the safety aspects of. the system.

Still another object comprehends the simpli- I flcation of the manually operable control unit in such a manner as to render it readily accessible to the operator and capable of operation in a manner simulating the movement of the conventional manually-operable gear shift lever.

Other objects and novel features of the invention will appear more fullyherelna'fter from a consideration of the "following detailed description when taken in connection with the accompanying drawings, wherein one embodi ment of the invention is illustrated. It is tobe expressly understood, however, that the drawings are not designed as a definition of the limits of the invention, reference being had to the appended claims for this purpose. H

In the drawings, wherein similar reference characters refer to like parts throughout the several views:

Fig. l is a perspective view, partly in section, of a gear-shifting mechanism constructed in' Fig. 4 is a partial view in'perspective ofthe cam carried by the, shifter piston rod;

Fig. 5 is an axial sectionalview of the selector motor and a portion of the transmission;

Fig. 6 is a,plan view, partly in section, of the selector motor and valves controlled thereby;

Figs. 7 and 8 are partial views in section taken along lines 'I--'| and 8-8 of Fig. 2, and

Fig. 9 is an axial sectional view of the shifter motor.

Referring more particularly to Fig. 1, the -present inventionis illustrated therein in connection with an automotive vehicle having a steering column l0 and a gear-changing transmission II. The latter has associated therewith a fluid pressure-operated gear-shifting apparatus l2adaptcd to be supplied pressure from a reservoir IS, a remotely-positioned manually-operable control valve mechanism it being operably positioned adjacent the operator, as for example being mounted upon the steering column, in order that the flow of fluid pressure from the reservoir to the poweroperated gear-shifting apparatus may be conveniently controlled.

The ratio-changing transmission. II is of the general type utilizing a plurality of reciprocable shift bars-for eflectingthe desired gear ratio. As illustrated, three shift bars i5, i6 and i'I-are 'slidably mounted in the transmission housing It andrespectively carry shift forks I9, 20 and 2i which are adapted to establish the desired gear ratios when reciprocated by the shift bars. The shift bars I5, Itand II are preferably so arhowever,

accordance with the principles of the present invention; v

Fig. 2 is. a side view of the control valve mechanism, certainbf the parts being shown in section;

Fig. 3 is a front view, partlyin section,-,of mechanism of Fig. 2;

the

mission II that, referring to Fig. 1,movement of bar I! to the right is effective to establish first gear relation, movements of the bar Iii to the left and right are effective to respectively establish second and third gear relations, while movement of the bar I! to the left serves to establish reverse gear relation. It will be understood, that the, power-operated control mechanism, though particularly illustrated and described below for securing the above movements of the shift rods, may be adapted for moving the bars in other relations which may be necessary in other types of transmissions.

In order to select a. desired shifter bar for subsequent shifting to efiect the desired gear ratio, a combined. selector and shifter finger 22 is adapted to cooperate with-the shifter forks, the said finger being oscillatable to effect the aforesaid selecting movement by means of a fluid motor 23 to which fluid pressure is admitted from the shifter motor.

through conduits 24 and 25. The subsequent shifting of the finger 22 and the selected shift rail engaged thereby is accomplished by a shifting motor 26, the latter being supplied with fluid pressure through conduits 21 and 28. Shifting motorv 26 includes apiston 29, see Fig. 9, having a piston rod 30 towhich-the finger 22 is lecured. Preferably, the piston rod 30 is extended and its outer extremity has associated therewith a neutralizing or centering mechanism 3| for nor-' mally maintaining the finger 22 in central or neutral position when fluid pressure is exhausted As illustrated more particularly in Fig. 5, the

fluid motor 23 for effecting selecting movement of the finger 22 includes a piston 32 having a piston rod 33, the outer end of which in formed with a notch 34 for receiving an upstanding flanged portion 35 of the finger 22. As will be readily understood from this figure, movement 01' the piston 32 in opposite directions will eflect oscillating movement of the finger 22 about the piston rod 30 of' the shifter piston 29, The selector piston 32 is preferably normally main- )tained in the central orneutral position as shown, by means of a double-acting centering spring 36, the latter being confined between cups 3'! and 38. Cup 31 is provided with a pair of flanged portions 39 and 40 bearingrespectively upon the piston 32 and against an abutment 4| of the motor 23, while cup 38 has a ,pair of oppositely-flanged extensions 42 and 43 which respectively bear against a nut 44 carried by the righthand extremity of piston rod 33 and a, cap 45 of the motor 23. In assembling the spring 36 -between'the cups 3'! and, the spring is initially preloaded a slight degree, and, from this construction, it will be readily understood that, upon release of fluid pressure from both sides of the piston 32,,the spring 36 will serve to move the piston to the central neutral position shown where the. finger 22 is operatively associated with the center shift bar 16. 'I'hus, the combined selector and shifter finger is normally in engagement with the shifter fork 20' and the latter may be moved to the left and the right, as viewed in Fig. 1, in order to establish the second or third gear relation merely by energizing the shifter motor in one or the other direction. However, in.

the event that it is desired to selecteither of the shift bars l or H, fluid pressure is admitted through the conduits 24 or 25 in order to eflect movement oi. the selector piston 32 to theleft or right, as viewed in Fig. 5. Release of fluid pressure from the selector and shifter motors will enable the neutralizing elements associated therewith to function in order to returnthe shifterflnger to the position illustrated in Fig. 1.

Asset forth above, in order to establish first gear relationshift bar l5 must be moved to the right, as viewed in Fig. 1. Prior to this shifting movement of the bar 15, the selector finger 22 must be moved by the selector motor in order that the finger 22 engage the shifter fork is carried by bar 15. It is highly desirable, in a remotely-controlled fluid pressure-operated gearshifting mechanism of the character described herein,-to interlock the operation of the selector and shifter motor in such a manner as to enable sequential operation of these devices. In other words, the application of fluid pressure to the trolling the flow of fluid pressure to the shift motor dependent upon operational the selector motor 23. Since the shifter bar ll utilized for securing reverse gear relation in the present invention must also be selected prior to shifting; the aforementioned means is also so constituted as to delaythe application of fluid pressure to the shifting motor 26. until after such movement of selector 23 has occurred that the finger 22 has selected the bar I 1.

The means for accomplishing the foregoing results are constituted by a pair of similar valve devices 46 and 41, see Figs. 1 and 6. Since these valve devices are identical in construction, the

constituent parts of one only will be described- -in detail. As will appear more fully from a consideration of Fig. 6, the valve 46 includes a casing 48 havinga partition casing into outlet and 49 therein dividing the exhaust chambers 50 and 5| respectively. A valve member 52 includes an exhaust head 53 and an intake head 54, the former being positioned within the outlet chamber and the latter being located within an inlet chamber 55 formed by a cap 56. The valve 52 is normally maintained in the position illustrated in Fig. 6 by means of a spring 51 engaging head 54 and urging the valve to a seat formed in a partition 58. This results in the interruption of communication between intake chamber 55-and outlet chamber 50. A valve-operating member 59 is slidably mounted within casing 48 and is provided with a bore 50, the open end of which forms 'an exhaust valve seat 6|. means, such as spring 62, is confined between partition 58 and one end of the valve-operating member 59 and serves to normally move the exhaust valve seat 6| away from head 53, thus connecting the outlet chamber 50 with the exhaust chamber 5| through an opening 53' located in the wallet member 59. The opposite end of the latter is engaged by a suitable cam 64 which is normally engaged with a reduced portion 65 of the selector pistonrod 33. On eitherside of the portion 65, the piston rod 33 is provided with cams 56 and 61, it being pointed out that, upon movement of the piston rod 33 in opposite directions. these cams are eflective through their cooperation with cam'64 to move the valve-operate ing member 59 in such a manner as to close the exhaust head 53 and open the intake head .54, thus interrupting communication between chambers 50 and SI and establishing communication tion of shifter motor 25 with the so shifter motor to shift the bar II, for example,

should be delayed until after, flnger22'has been moved to select this bar. In order to secure this very desirable result, means are provided for conber is'adapted to be supplied with fluid pressure through a conduit 83, and, when the above mentioned communication between chambers ,54 and I5 is established such fluid pressure is conducted to conduit 28 which connects the right-hand'porrce of fluid pressure. j

Since the valve device 41 is similar in every respect to the valve described in detail above, it will be understood that, upon movement of piston 33 and consequent operation of valve 41 by cams "or 51, conduits and 21 will be interconnected,'and, since the-latter communicates with the left-hand portion of shifter motor 26, as viewed in Fig. 9, fluid firessure will be conducted to thisside of the motor in the event that conduit 43 is connected with the source of fluid pressure.

The valve devices. 48 and 41 are further so arranged that, when the selector motor 23 is deenergized, such valves arein a position to conduct fluid pressure to oneside or the other of Resilient 'of the shifter motor 28. However,

. derstood from Fig. 6,

. pressure. Since conduit 25, leading to the lefttheshifter motor 28 in accordance with .the operation of the remotely controlled valvular mechanism H. In this way, the shifter motor 26 maybe energized in' opposite directions in order to effect an establishment of the second or third gear relation through movement of the sl iftefbar l6. Referring to Fig. 6, with the parts in the position therein shown, it willibe perceived that conduit 28 is connected with aconduit18 past theopen valve head 53, bore ,88 10 and port 83. In likemanner, conduit 21 connected with valve device 41 communicates with a conduit 1|. Conduits 18 and 1l are adapted I to be connected with the fluid pressure source 13 through operation of the valvular mechanism M, and thus, when it is desired to establish second or third gear relation, it is only necessary to charge either conduit 18 or conduit 1| whereupon the valve device 88 or 41 will be effective to conduct the fluid pressure-to one or the other side if .flrst gear relation is desired, conduit 28 is connected with the supply of fluid pressure through suitable operation of the valvular mechanism ll. As will be observed from Fig. 5, fluid pressure is thereupon conducted to the right-hand portion of the selector motor 23 and the piston 32 of the lat- -ter is thereupon. moved to the left in order. to

oscillate the finger 22' to a position to engage shifter fork; IS on shift bar l5. As will be unat about the time the selector piston rod 33 has moved to a position such that the finger 22 has engaged the fork I8, cam 61 will move the valve-operating element of the valve device 41 in order to establish communication between conduits 88 and 21. Since the former is connected with conduit 24, see Fig.. l, and is thus supplied with fluid pressure,'such pressure will be conducted through conduit 21 to the left-hand end of the shifter motor 26. The piston of the latter, together with the flnger 22 secured thereto, will thereupon be moved to the right, as viewed in Figs. 1 and 9, and thus the first'gear relation will be established.- In this connection, it will be observed that only one conduit, namely 28, need be connected with the source of fluid pressure, the interlocking arrangement between the operation of the selector motor and shifter motor enabling proper sequential action of these elements.

It will be observed, moreover, that the same sequential action is inherent in the apparatus of the present invention in establishing reverse gear relation. For example, in this operation, it is only necessary to charge conduit 88 with fluid hand portion ofselector motor 23, see Fig. 5, is connected with conduit 88, Fig. 1, piston 32 of the selector motor will be'moved to the right and he finger'22 will be engaged with the shifter 80 fork 2| on shifter bar 11. As soon'as this has occurred, cam 68 on the piston rod 33, through cooperation with cam 64. will serve to operate valve 52, thus establishing communication between conduit 88, charged with fluid pressure, and conduit 28, leading to the right-hand portion of shifter motor 28, Fig. 9. Piston28 of the latter will thereupon be moved to the left in. order to secure reverse gear ratio. I

In order to control the communication between conduits 28, 88, 18 and -1l and the source at fluid pressure l3, the valvular mechanism I8 is provided. Referring to Figs. 2 and 3, such valvular mechanism includes a casing -12 housing a plurality of valves, one foreach of the four above 15 mally, a sprin her 83, common to all of the valves.

manner as to be capable aforementioned valves is similar in construction,

one only As will has been broken away in order section the valve for controlling fluid pressure flow through conduit 1|. Therein, it will be seen that a valve 15 is provided with an intake head 16 positioned in the common inlet chamber 13 and an exhaust head 11 located within an outlet chamber 18. The latter chamber is connected with conduit 1| through a suitable opening positioned in'the side of the casing 12. Nor- 19 maintains the valve 15 in the position shown, wherein valve head 18 closes communication between chambers 13 and 18. In this position of the parts, a valve-operating will be described in detail.

be observed from Fig. 2, the casing 12 to illustrate in member 88, provided at its upper end with an. exhaust valve seat 8|, is urged downwardly by a spring 82, thus connecting, through openings 84, the outlet chamber 18 with an exhaust cham- Thus, in the inoperative position of valve 15, the outlet chamber 18 connected with conduit 1! communicates with the atmospheric exhaust through openings 84. Asheretofore stated, the remainin'g-valves ofv the valve mechanism I! are identical with the valve 15, and. 'for the sake of clarity in the following description, it will be -here noted that the valve, controlling conduit 68, is provided with an operating member 85, the

valve, controlling conduit 18, is operated by a member 88, while the valve-operating member for the valve, controlling conduit 28, is indicated In order to selectively operate the valves in the housing 12, there is provided by the present invention an operating rod or member 88 which is mounted at the bottom of casing 12 in such a of longitudinal and rotatable movement with respect thereto. This valve-operating memberhas formed thereon a pair of cams 88 .and 88 for selectively operating the various valve-operating members 88, 85, 88 and 81 depending upon the longitudinal position of the rod 88 with respect to such members and dependent also upon the direction ofrotation of the member 88. As will be observed from Figs. '1 and 8, the valve-operating rod 88 is normally so positioned that the cams '88 and 88 are in contact with balls 8| tively associated with the valve-operating members 86 and 88. Thus, counterclockwise 'movewill, through ment ofrod 88, as viewed in Fig. 7, cooperation of cam 89 and ball 8!, move the valve-operating member 88 upwardly in order to connect the intake chamber 13 with conduit 18. On the other hand, as viewed in Fig. 8, clockwise movement of rod 88 will operate valve 15 through cooperation between cam 98 andball 92. Movement of valve 15 upwardly will serve to connect the intake chamber be observed from Fig. and 88 are of capable of operating only the balls 8! or 82 as the rod 88 is rotated in one direction or the other as the latter occupies the longitudinal position showm However, if the rod 88 is moved to the left, as viewed in brought out to ball 8| and brought into cooperationwith the 2, the cam surfaces 88 and 82 which are respec- 13 with conduit 'H. As will such longitudinal extent as to be Fig. 2, cam 88 will be I of cooperative relationwith respect pivotal movement, the

ball 83. associated with the valve-operating member 85. Thereupon,- if the rod 88 is moved in a counterclockwise direction, as'viewed in Fig. 7, the valve controlled by'the valve-operating member 85 willbe opened in orderto conduct fluid pressure to conduit 88. On the other hand, it it is desired to operate the valve controlled by valve-operating member 81, the rod 88 is moved to the right, as viewed in Fig. 2, a sufllcient distance to bring cam 88 tion with ball 84. Thereu-pon, rod 88 is moved counterclockwise, as viewed in Fig. 8, and the valve controlled by movement of the valve-ope into cooperative relacrating member 81 is moved to open position and connects conduit 24 with the source of fluid pressure through'intake chamber 18 and conduit 14.

As illustrated in Figs. 1 and 3; a suitable bracket I88 is secured to the casing 12 of the .valve mechanism I8 .in order to provide a support for the latter.

For the purpose of controlling the rotatable and longitudinal movements of the valve-actuating rod 88, a member I8I is secured to one end of the rod, as by means of a pin I82, and is extended outwardly of the rod 88 to a position conveniently accessible to the operator. A sleeve I 83 surrounds member I 8I and'is so constructed as to be capable of rotating the latter. This action is achieved through the provision of a pin I84 located in the side wall of the sleeve and extending into a longitudinally-extending slot or keyway I85 position d in member IN. This construction also enables the member I M to be moved axially with respect to the sleeve I 83 in order to effect the above mentioned selecting movement of the valve-actuating rod 88.

In order to control the axial movement of member I M and the rotatable movement of the sleeve I83, a-manually-operable control lever I86 is operatively connected to these elements. As illustrated in Fig. 2, the -lower end I81 of this lever is located in a. slot I88 formed in member I8I, and the lever is pivoted intermediate its ends, as by means of a pin I88, to a pair of upstanding arms II 8 and with the sleeve I 83. The pivotal connection at I89 is such that the lever I88 may be oscillated to the left and right, as viewed in Fig. 2, and, during this operation, the lower end I81 of the lever will move the member I8I axially in a corresponding direction. However, if the lever I86 is moved at right angles to the aforementioned supporting arms H8 and H812 secured to the sleeve I88 will rotate the latter and, through the pin and slot connection I88, I85, will rotate member ,I8I in a corresponding direction. j

Novel means are provided for suitably guiding II8a formed integrally rotate the sleeve I83. In the particular arrangement illustrated, movement'of the lever I88 into slot-I I8is efl'ective to operate the valvecontrolled by the actuating member 81 in order to establish first gear ratio. Movement of the lever I88 into slot II1 secures second gear relation, movement of the leverinto slot II 8 establishes third gear ratio, while reverse gear is secured by movement of lever I88 into slot II 8. In the-position of the parts illustrated, the actuating lever I88 is so located in the transverse slot II5 as to be capable of movement into either of the slots H1 or 8 to establish second or third gear relation. Pivotal movement ofthe lever to theleft, as viewed in Fig. 2, will secure such movement of sleeve I83, member I8 I' and rod 88 as to select the valve for controlling first gear, while pivotal movement in the opposite direction will so'position the above mentioned parts as toselect the valve controlling reverse gear relation. In this connection, it will be observedthat the action of the controlling lever I88 is somewhat similar to the methodof operation of the usual manually-operable gear-shifting lever used in present-day automotive transmissions.

'Any suitable mounting bracket, such as that shown at I 28 in Fig. 1, may be employed for securing the quadrant III to the steering column I8. While, in Fig. 1, thevalvular mechanism I8 hasbeen shown in a location relatively closely adjacent the controlling lever I88, it will be understood that the member I8I maybe of any length desired and that such an arrangement enables the valvular mechanism I4 to be'mounted at a remote position with respect to the lever I88, such as, for example, on the steering column I8 beneath the floorboards of the vehicle.

As heretofore which were actuated by movement of the selector piston and which controlled the flow of fluid the various movements of the lever I88 in order of the quadrant is suitably formed for guiding the various movements of the lever I88. As will be readilyunderstood from Figs. 2 and 3, atransverse slot II 5 permits oscillating movement of the lever about pivot I88 while-slots II8,'II1, H8 and H8 serve to guide the move- To this end, aplate' or quadrant III is ments of the lever m which are efiective to depression I28.

is employed for normally pressure'to the shifter motor. As an additional feature, the present invention includes an interlock between the selector and shifter motors which is so constituted-as to positively prevent movement of the selector piston until the particular shift rod, with which the finger 22 is engaged, is returned to neutral position. 7 To this end, and referring to Figs. 4 and 5, the finger 22 is so formed as to provide a pair of cams I2I and I22 which are located upon opposite sides of a When the finger 22 is in its central or neutral position, the depression I 28 receives a pin I28,.Fig. 5. Pin' I28 hasv formed thereon a reduced portion 7 lower end of a 'detent I28, and, in the neutral position, it will be understood from Fig. 5 that the detent I28 may move-downwardly in order to be freed from the notches I21, I28 or I28 positioned along the length of the piston rod 88. Thus, when fiuid pressure is conducted to the selector motor, the piston 82 of the latter may be moved in the proper direction. A spring I38 urgingthe pin I28 into engagement with the finger 22. 7 event that the finger 22 has been. moved into selective engagement with any one of the shift rods I8, I8 or I1 and has been shifted with the selected rod through energization of the shifter motor, the pin 1 stated, the present invention utiliz es an interlock between the selector and shifter.

I25 for receiving the However, in the 1 I28 occupies the position illustrated in Fig. 5. Thus, detent I26 is cammed upwardly into engagement with any one of the notches I21, I23 or I29 in order to positively lock the pistonrod 33 against movement in either direction until the finger 22 is returned to neutral position, whereupon the depression I23 is adapted to again receive pin I24 and thus enable the detent I25 to drop down into the reduced portion I25.

Referring to Fig. 9, the neutralizing mechanism 3| is preferably constituted by a spring I3I housed within a casing I32 formed as an extension of the transmission housing. Opposite ends of the spring are confined by cups I33 and I34, the former having flanged extensions I35 and I36 respectively abutting casing I32 and a washer I31 confined between a nut I33 and a sleeve rounding the outer end of piston rod 30. Cup I34 is likewise provided with flanged extensions I40 and MI respectively abutting the casing I32 and a sleeve I42 carried by piston rod 30, such s eeve bearing against the central portionof the finger 22. In assembling the above described tion has been illustrated anddescrlbed herein I39 sur-,

parts, the spring I3I is placed under initial compression and thus, through the cooperation between the cups I34 and I35 with washer I31 and sleeve I42, serves to constantly urge the piston rod to its central neutral position.

In order to dampen any noise which may result from movement of the cups I33 and I34 in opposite directions during gear-shifting operations, lubricant within the casing containing finger 22 may be conducted into the casing 432 as by means of a duct I43. Thus, casing I32 may be maintained partially filled with lubricant, and any noisy operation of the neutralizing arrangement will be effectively dampened. A further dampening arrangement for reducing noise ati'endant-upon reciprocation of the piston rod 30 is secured by the utilization of two pairs of dished washers I44 and I45 surrounding piston rod 30- and located upon either side of finger 22. Since the casing housing the finger 22 is adapted to contain lubricant, the spaces between these dished washers will likewise contain lubricant which, upon reciprocation of'the piston rod 30, will be squeezed out when the washers are pressed between the stationary casing portions and the finger 22.

A suitable supply of lubricant is conducted to the piston zsthrough a conduit I46, said lubricant being received in a chamber I41, Fig. 9, and conducted-to the periphery of the piston through ducts I43, I49 and I50. Lubricant may also be conducted to the selector piston 32, Fig. 5, through a conduit I5I, this arrangement serving to maintain the packing utilized in the piston in a proper condition. From the foregoing of the invention will be readily be also understood. that the mechanism herein described is preselective inits operation. For example, trol lever I06 into any one of its four positions automatically causes a selecting and shifting operation of the fluid pressure-operated gearshifting control mechanism. Hence, if the present invention is employed with a transmission of the type which may be only shifted from one position to another upon a reversal of torque occurring in the output shaft of the, transmission, the various valves may be preset by movement of the lever I05 to a desired position andthe gear relation will not be established until the snb-. sequent reversal of torque has occurred.

movement of the con;

While one embodiment of the present invenwith considerable particularity, it will be understood that the same is not limited thereto but is capable of expression in a variety of forms, as well understood by those skilled in the art. For example, while the present apparatus has been described in connection with operation by fluid from a source of pressure, it is a source of any fluid oil, may be utilized.

art without departing from the spirit .of the invention. Reference will therefore be had to the appended claims for a definition of the limits and motor comprising manually-operable valve mechanism including a plurality of selectively operable valves, means connecting saidvalve's to said fluid pressure means, means including a pair of valve devices operable by operation of said fluid pressure means to connect a portion of said valves and fluid motor, and means including said pair of valve devices for connecting said fluid motor and another portion of said valves when said fluid pressure means is deenerdescription, it is believed gizedr 2. In a control mechanism for a power-operated gear-shifting apparatus having a member movable to select and shiftable to establish a desired gear relation, a double-acting fluid motor including a. pressure-responsive member for moving said member in opposite directions, manually-controlled valve means for selectively controlling the admission of fluid energy to either end of said motor toenergize the latter, a second double-acting fluid motor for shifting said member, means including a pair of valve devices operable by movement of said pressure-responsive member in opposite directions for controlling the admission of fluid energy to said second motor, other manually-controlled valve means, and means connecting said second motor and said other valve means through devices when the first motor is deenergized.

3. In a control mechanism for a power-operated gear-shifting apparatus having a member movable to select and shiftable to establish a and shifting operations of said member, manually-controlled valve mechanism operable to a predetermined position corresponding to the gear relation desired, means'to energize the selectin motor in either of opposite directions in accord ance with operation of said mechanism to one or another position corresponding to a pair of gear relations desired, means including .a pair of valve devices operated by movement of said selecting motor for energizing one end or the other of the shifting motor depending upon the position of the valve mechanism, and means operable upon movement of the valve mechanism contemplated that power, such as vacuum or Various other changes and l modifications will occur to those skilled in the the pair of valve mounting said last movement in opposite directions from to one or another position corresponding to a pair of diiferent gear relations for connecting either end of-said shifting motor to said valve mechanism through one or the-other valve device.

4. In a control ated gear-shifting mechanism for a power-operapparatus having a-member movable to select and shiftable to establish a de-' sired gear relation;

motors for respectively -efl'ecting selecting and a pair of double-acting fluid shifting operations of said member, a source of fluid pressure, connections between said source and opposite ends or said motors, a valve in each of said connections, a rotatable valve-operating member common to all of said valves, means for named member for axial a normal central position, meanscarried by said valve-operating member 7 valves dependent upon the axial position 01' the for selectively operating said valve-operating member and thedirection of mtation thereof, a manually-operab.e lever for moving said valve-operating member axially and for rotating the same in opposite directions and.

valvular means interposed in said connections for controlling theflow of fluid pressure thereforselectively rendering said connections, efl'ecpermit the flow .of fluid pressure from said valves to said fluid motor through said valvular. means and connections.

5. In combination with a gear-shifting mechbyone of said fluid motors anism hav nga plurality of elements movable one direction, a fluid motor to operate said member in said other direction, and means for controlling the fluid pressure-energization of said fluid pres- 6. In combination with a gear-shifting mechanism having a plurality of shift bars movable in opposite directions to establish desired gear relations, of a power-operatedcontrol mechmotor comprising a plurality of 'the associated valve erated by movement of said fluid-operatedmeans in opposite directions for controlling the energization 01 said fluid motor on operation of said flrst two pairs or valves, and means for selectiveone for each valve of said and positioned to operate upon rotation of said ro tatable member in opposite directions.

7. In combination cams carried thereby, first and second-pair direction from a central position for locking the flrst power means and element against operation.

a desired gear relation, a pair for respectively controlling the move ents or said element in said planes, a plurality of valves for other motor.

ROY S. SANFORD.

' J. ANDRES. FREDERICK F. ROI-IRER, JR. 

